Manufacture of bolting cloth, grit gauze, and the like



Oct. 10, 1944." A. MQFARLANE 2,360,245

MANUFACTURE OF BOLTING CLOTH GRIT GAUZE AND THE LIKE Filed April 9, 1945 "L" [TL PL r I i f INVENTOR Ross/PT A NCEZRLA/VE fl/ ATTO R NEYS Patented Oct. 10, 1944 MANUFACTURE OF BOLTING CLOTH, GRIT GAUZE, AND THE LIKE Robert Andrew McFarlane, Braintree, England,

assignor to Courtaulds Limited, London, England, a British company Application April 9, 1943, Serial No. 482,516 In Great Britain May 19, 1942 centigrade. The resin is then cooled to 150 cen- 8 Claims.

It has been proposed to produce bolting cloth, grit gauze and the like, which Iwill hereinafter refer to as bolting cloth, from nylon, but the cloth has been found to be unsatisfactory, the opinion having been expressed that the nylon threads do not remain in their place in the 'woven fabric owing to thehard and glassy nature of the filaments and smoothness of their surface, resulting in uneven apertures.

I have now found that a satisfactory bolting cloth of good wearing quality can be produced from nylon threads containing one or more continuous filaments if the threads be prevented from slipping over one another by treatment with a resin-like polyhydric alcohol-polybasic acid condensation product, in the presence of a small .quantity of a compound such as diphenylguanidine or phenol, or trichlorethylene, which assists the nylon threads to take up the said resinlike condensation product. In carrying out my invention I may make use of the resin-like polyhydric alcohol-polybasic acid condensation product, either as such or modified as for instance by heating with 'oil and/or urea or urea-formaldehyde condensation products. In place of one such resin-like condensation product, I may use a blend of such products. The production of a solid resin-like product from glycerol and phthalic anhydride was described in J. S. C. I., 1901, 20, page 1075: reference is also made to them in British Plastics, volume X, page 621. Such products have been put on the market under the name Glyptal which is a registered trade-mark.

The fabric may consist entirely of nylon threads, or it may be made from nylon and other threads, such as silk or rayon,. and the threads may be interwoven in leno weave or plain weave or in a mixture of these two weaves. multifilament threads are employed, they should be given sufiicient twist to confine the filaments to the parent thread; to 40 turns per inch are convenient for this purpose, but I do not restrict my invention to this definite range. I

The following example will illustrate the nature of this invention, which however, is not limited to this example. The parts are by weight.

Example 10 parts of phthalic anhydride and 2 parts of castor oil are heated together at 220 centigrade for 10 minutes. 6 parts of glycerine are then added and the whole heated in a current of nitrogen at from 220 to 240 centigrade until the resin has a glycerine-like consistency at 180 When tigrade and diluted with an equal amount of ethylene glycol monoethyl ether, sold under the registered trade-mark Cellosolve. A mixture is prepared from 10 parts of the solution of the oil-modified resin-like condensation product made as above described, with half a part of diphenylguanidine. '78 parts of benzol and 13 parts of ethyl alcohol. A nylon bolting cloth woven into leno weave with monofil-of 25 denierl is passed on a padding machine through this mixture, and the cloth is dried to width on a pin stenter.

In the accompanying drawing which diagrammatically illustrates nylon bolting cloth according to the present invention,

Figure 1 represents a plain weave bolting cloth;

Figure 2 is a section on the line 2-2 of Figure 1;

Figure 3 represents a half leno weave bolting cloth; and v Figures 4 and 5 are sections on the lines 4-4 and 5--5, respectively, of Figure 3.

In the drawing, the threads A are warp threads and the threads B are weft threads, the threads being held together at their points of intersection by a layer E of polyhydric alcoholpolybasic acid condensation product. In Figures 3, 4 and 5 additional warp threads C and D are shown arranged to provide the half leno weave, the threads 0 and D also being fixed in position by the layer E.

What I claim is:

1. As a new article of manufacture bolting cloth, grit gauze and the like, consisting of nylon threads and having the mesh fixed by a resinlike polyhydric alcohol-polybasic acid condensation product together with a small quantity of an organic compound which assists the nylon to take up the resin-like condensation product.

2. As a new article of manufacture bolting cloth, grit gauze and the like, consisting of nylon threads and having the mesh fixed by a resinlike polyhydric alcohol-polybasic acid condensation product applied in the presence of a small quantity of diphenylguanidine.

3. As a new article of manufacture bolting cloth, grit gauze and the like, consisting of nylon threads and having the mesh fixed by a resinlike polyhydric alcohol-polybasic acid condensation product applied in the presence of a small quantity of phenol.

4. As a new article of manufacture bolting .cloth, grit gauze and the like, consisting of nylon threads and having the mesh fixed by a resinlike polyhydric alcohol-polybasic acid condensation product applied in the presence of a small quantity or trichlorethylene.

5. As a new article of manufacture bolting cloth, grit gauze and the like, consisting of nylon threads and having the mesh fixed by a modified resin-like polyhydric alcohol-polybasicacid condensation product together with a small quantity of an organic compound which assists the nylon to take up the modified resin-like condensation product.

6. As a new article of manufacture bolting cloth, grit gauze and the -like,- consisting of "I. A process of treating a nylon bolting cloth, grit gauze and the like so that the tendency of the warp and weft threads to slip over one another is reduced, which process comprises applying to the material a resin-like polyhydric alcohol-polybasic acid condensation product in the presence of a small quantity of an organic compound capable of assisting the nylon to take up the resin-like condensation product.

8. A process of treating a nylon bolting cloth so that the tendency oi. the warp and weft threads to slip over one another is reduced, which process comprises applying to the material a castor oil-modified resin-like glycerinephthallc anhydride condensation product in the gfesence of a small quantity of diphenylguani' ROBERT ANDREW McFARLANE. 

